Unit 6 Practice Test Key

Unit 6 Practice Test

1. Which of these does not provide evidence for evolution?

A. The fossil record

B. Analogous structures

C. Comparative embryology

D. Biogeography

E. Comparative anatomy

2. The bottleneck effect is an example of which cause of evolution?

A. Gene flow

B. Natural selection

C. Mutations

D. Genetic drift

E. Non-random mating

3. Lamarck's view of evolution differed from Darwin's in all of the following ways except

A. Acquired characters were passed on

B. Organisms adapt to the environment

C. Organisms will eventually be perfect

D. Organisms changed due to inner need to change

E. These are all different from Darwin's view

Questions 4-8 use the following as answers. Each may be used once, more than once or not at all.

A. Fossil record

B. Comparative embryology

C. Comparative anatomy

D. Molecular biology

E. Biogeography

Identify what type of evidence each of the following represent

4. Darwin noticed that South American animals were different from European animals E

5. Pig fetuses and human fetuses are similar B

6. Chimpanzees and humans share 99% of their DNA D

7. Whales, humans and bats all have similar bone structures C

8. Species are closely related to those living around them E

9. Which of the following will not lead to microevolution?

A. Sexual reproduction

B. The bottleneck effect (genetic drift)

C. The founder's effect (genetic drift)

D. Organisms breeding with other populations (gene flow)

E. Organisms being selective in their mates (non-random mating)


10. 36% of a non-evolving population is homoygous dominant. What percent of the population express the dominant trait?

A. 60%

B. 40%

C. 16%

D. 84%

E. 64%

11. The smallest unit that can evolve is

A. A cell

B. An individual

C. A population

D. A species

E. A genus

12. Which of the following statements about natural selection is most correct

A. Adaptations that are beneficial in one habitat should be beneficial in other habitats

B. Different species that occupy one habitat should adapt to the environment in the same way

C. Organisms become more and more perfect

D. Populations change over time as better adapted organisms are more likely to pass on their genes

E. Natural selection is the only way species evolve

13. Which of the following statements about evolution is true?

A. Evolution always leads to better adapted organisms

B. Evolution always increases biological diversity

C. Evolution always leads to bigger stronger species

D. Evolution always leads to a change in the gene pool

E. Evolution is never random

14. 25% of a population is recessive. What percent of the population are heterozygous?

A. 25%

B. 50%

C. 75%

D. 36%

E. Cannot be determined from this information

15. Out of a population of 500, 100 are homozygous dominant, 200 are heterozygous and 200 are recessive. The allele frequency of the dominant allele is:

A. 20%

B. 40%

C. 60%

D. 80%

E. 50%


16. A plant species has twice as many chromosomes as a closely related species. This is an example of ________ due to an error in ___________

A. Mutation, DNA replication

B. Mutation, meiosis

C. Polyploid, DNA replication

D. Polyploid, meiosis

E. Adaptation, meiosis

17. Which of the following is most likely to cause two populations to become different species?

A. Mutations

B. Sexual reproduction

C. Different environments

D. Sexual selection

E. Polyploidy

18. Which of the following best describes Darwinian fitness?

A. An organism's ability to survive

B. An organism's ability to mate

C. An organism's ability to survive and mate

D. An organism's ability to dominate its opponents

E. An organism's ability to have viable and fertile offspring

19. Through time, the movement of people on Earth has steadily increased. This has altered human evolution by increasing

A. Non-random mating

B. Geographical isolation

C. Genetic drift

D. Natural selection

E. Gene flow

20. Why haven't we all evolved to be brown haired and brown eyed like Mr. Mahon?

A. Looking like Mr. Mahon decreases the ability to survive

B. Blonde hair is an advantageous trait

C. It is advantageous to have different hair colors and eye colors

D. Hair and eye color is a neutral variation in humans

E. All humans will eventually evolve into Mr. Mahon

21-25 use the following as answers:

A. Random selection

B. Directional selection

C. Stabilizing selection

D. Diversifying selection

E. Sexual selection

  1. An African butterfly species exists in two strikingly different color patterns D

  2. Brightly colored peacocks get more ladies E

  3. Almost all babies are within in narrow birthweight range C

  4. Horses have gotten bigger over time B

  5. Birds of paradise make smiley faces E


26. Which of the following is not a problem with the biological definition of species?

A. Extinct species

B. Asexual species

C. Coyotes and dogs can mate

D. Many different species can mate under laboratory conditions

E. These are all problems with the biological definition of species

27. Which of the following is not a prezygotic barrier to reproduction?

A. Behavioral barriers

B. Gametic barriers

C. Hybrid infertility

D. Habitat barriers

E. Mechanical barriers

28. Which of the following does not describe an adaptive radiation?

A. Many species of insect evolved quickly after the development of wings in a common ancestor

B. All of the species of lemur on a particular island have a common ancestor

C. The movement of humans to different parts of the world has led to many different populations that all came from one ancestor

D. Darwin's finches are all came from a single colonizing species

E. An island in New Guinea has many similar species of frog that are different colors (not necessarily from the same ancestor)

29. Which of the following is not an adaptive zone?

A. The development of lungs allowed the evolution of terrestrial animals

B. Extinction of the dinosaurs allowed mammals to evolve

C. The formation of a new island

D. A predator goes extinct

E. These are all examples of adaptive zones

30. Similar fossils have been found in Ghana and Brazil. This is most likely because:

A. The species swam from Ghana to Brazil

B. These fossils are probably from the time of Pangaea

C. The species of Ghana and Brazil are similar today

D. Ghana and Brazil have similar environments

E. The fossils are probably birds that migrate

31. Bat wings and human arms are ____________. Bat wings and bird wings are_________

A. Analogous, homologous

B. Homologous, analogous

C. Analogous, analogous

D. Homologous, homologous

E. Batman, robin

32. Reptiles are not an ideal taxonomic group because

A. It is monophyletic

B. Crocodiles and lizards do not share a common ancestor

C. Birds and reptiles share a common ancestor

D. Reptiles evolved from birds

E. Reptiles should include amphibians